ALSA: control led: fix memory leak in snd_ctl_led_register

The snd_ctl_led_sysfs_add and snd_ctl_led_sysfs_remove should contain
the refcount operations in pair. However, snd_ctl_led_sysfs_remove fails
to decrease the refcount to zero, which causes device_release never to
be invoked. This leads to memory leak to some resources, like struct
device_private. In addition, we also free some other similar memory
leaks in snd_ctl_led_init/snd_ctl_led_exit.

Fix this by replacing device_del to device_unregister
in snd_ctl_led_sysfs_remove/snd_ctl_led_init/snd_ctl_led_exit.

Note that, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device will
call kobject_release and delay the release of kobject, which will cause
use-after-free when the memory backing the kobject is freed at once.

Reported-by: syzbot+08a7d8b51ea048a74ffb@syzkaller.appspotmail.com
Fixes: a135dfb5de15 ("ALSA: led control - add sysfs kcontrol LED marking layer")
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210602034136.2762497-1-mudongliangabcd@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/control_led.c b/sound/core/control_led.c
index 25f57c1..a90e31d 100644 (file)
--- a/sound/core/control_led.c
+++ b/sound/core/control_led.c
@@ -17,6 +17,9 @@ MODULE_LICENSE("GPL");
 #define MAX_LED (((SNDRV_CTL_ELEM_ACCESS_MIC_LED - SNDRV_CTL_ELEM_ACCESS_SPK_LED) \
                        >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) + 1)
 
+#define to_led_card_dev(_dev) \
+       container_of(_dev, struct snd_ctl_led_card, dev)
+
 enum snd_ctl_led_mode {
         MODE_FOLLOW_MUTE = 0,
         MODE_FOLLOW_ROUTE,
@@ -371,6 +374,21 @@ static void snd_ctl_led_disconnect(struct snd_card *card)
        snd_ctl_led_refresh();
 }
 
+static void snd_ctl_led_card_release(struct device *dev)
+{
+       struct snd_ctl_led_card *led_card = to_led_card_dev(dev);
+
+       kfree(led_card);
+}
+
+static void snd_ctl_led_release(struct device *dev)
+{
+}
+
+static void snd_ctl_led_dev_release(struct device *dev)
+{
+}
+
 /*
  * sysfs
  */
@@ -663,6 +681,7 @@ static void snd_ctl_led_sysfs_add(struct snd_card *card)
                led_card->number = card->number;
                led_card->led = led;
                device_initialize(&led_card->dev);
+               led_card->dev.release = snd_ctl_led_card_release;
                if (dev_set_name(&led_card->dev, "card%d", card->number) < 0)
                        goto cerr;
                led_card->dev.parent = &led->dev;
@@ -681,7 +700,6 @@ cerr:
                put_device(&led_card->dev);
 cerr2:
                printk(KERN_ERR "snd_ctl_led: unable to add card%d", card->number);
-               kfree(led_card);
        }
 }
 
@@ -700,8 +718,7 @@ static void snd_ctl_led_sysfs_remove(struct snd_card *card)
                snprintf(link_name, sizeof(link_name), "led-%s", led->name);
                sysfs_remove_link(&card->ctl_dev.kobj, link_name);
                sysfs_remove_link(&led_card->dev.kobj, "card");
-               device_del(&led_card->dev);
-               kfree(led_card);
+               device_unregister(&led_card->dev);
                led->cards[card->number] = NULL;
        }
 }
@@ -723,6 +740,7 @@ static int __init snd_ctl_led_init(void)
 
        device_initialize(&snd_ctl_led_dev);
        snd_ctl_led_dev.class = sound_class;
+       snd_ctl_led_dev.release = snd_ctl_led_dev_release;
        dev_set_name(&snd_ctl_led_dev, "ctl-led");
        if (device_add(&snd_ctl_led_dev)) {
                put_device(&snd_ctl_led_dev);
@@ -733,15 +751,16 @@ static int __init snd_ctl_led_init(void)
                INIT_LIST_HEAD(&led->controls);
                device_initialize(&led->dev);
                led->dev.parent = &snd_ctl_led_dev;
+               led->dev.release = snd_ctl_led_release;
                led->dev.groups = snd_ctl_led_dev_attr_groups;
                dev_set_name(&led->dev, led->name);
                if (device_add(&led->dev)) {
                        put_device(&led->dev);
                        for (; group > 0; group--) {
                                led = &snd_ctl_leds[group - 1];
-                               device_del(&led->dev);
+                               device_unregister(&led->dev);
                        }
-                       device_del(&snd_ctl_led_dev);
+                       device_unregister(&snd_ctl_led_dev);
                        return -ENOMEM;
                }
        }
@@ -767,9 +786,9 @@ static void __exit snd_ctl_led_exit(void)
        }
        for (group = 0; group < MAX_LED; group++) {
                led = &snd_ctl_leds[group];
-               device_del(&led->dev);
+               device_unregister(&led->dev);
        }
-       device_del(&snd_ctl_led_dev);
+       device_unregister(&snd_ctl_led_dev);
        snd_ctl_led_clean(NULL);
 }